Datasheet LT1681 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Dual Transistor Synchronous Forward Controller |
| Pages / Page | 20 / 4 — ELECTRICAL CHARACTERISTICS The |
| File Format / Size | PDF / 281 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LT1681
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VTS = 0V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Output Drivers
VTG TG On Voltage ● 11 11.5 V TG Off Voltage ● 0.1 0.5 V tTGr/f TG Rise/Fall Times 10% to 90%/90% to 10% 35 ns VBG BG On Voltage ● 11 11.5 V BG Off Voltage ● 0.1 0.5 V tBGr/f BG Rise/Fall Times 10% to 90%/90% to 10% 35 ns VSG SG On Voltage ● 11 11.5 V SG Off Voltage ● 0.1 0.5 V tSGr/f SG Rise/Fall Times 10% to 90%/90% to 10% 35 ns tSG-BG SG to BG Enable Lag Time 4V On/Off Thresholds ● 80 150 300 ns tTG-BG TG to BG Enable Lag Time 4V On/Off Thresholds 100 ns
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 3:
Guaranteed but not tested. of a device may be impaired.
Note 4:
The LT1681E is guaranteed to meet performance specifications
Note 2:
Supply current specification does not include external FET gate from 0°C to 70°C. Specifications over the – 40°C to 85°C operating charge currents. Actual supply currents will be higher and vary with temperature range are assured by design, characterization and correlation operating frequency, operating voltages and the type of external switch with statistical process controls. For guaranteed performance to elements used. See Applications Information. specifications over the –40°C to 85°C range, the LT1681I is available.
W U TYPICAL PERFOR A CE CHARACTERISTICS ICC Supply Current ICC Supply Current ICC Supply Current vs Temperature vs SHDN Pin Voltage vs VCC Supply Voltage
20 1100 18 V T CC = 12V A = 25°C TA = 25°C 19 900 17 18 17 700 16 SUPPLY CURRENT (mA) SUPPLY CURRENT (nA) SUPPLY CURRENT (mA) I CC I CC 16 I CC 15 500 15 –55 –40 0 40 80 125 0 100 200 300 400 500 9 10 12 14 16 18 TEMPERATURE (°C) SHDN PIN VOLTAGE (mV) SUPPLY VOLTAGE (V) 1681 G01 1681 G02 1681 G03 1681f 4
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VTS = 0V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Output Drivers
VTG TG On Voltage ● 11 11.5 V TG Off Voltage ● 0.1 0.5 V tTGr/f TG Rise/Fall Times 10% to 90%/90% to 10% 35 ns VBG BG On Voltage ● 11 11.5 V BG Off Voltage ● 0.1 0.5 V tBGr/f BG Rise/Fall Times 10% to 90%/90% to 10% 35 ns VSG SG On Voltage ● 11 11.5 V SG Off Voltage ● 0.1 0.5 V tSGr/f SG Rise/Fall Times 10% to 90%/90% to 10% 35 ns tSG-BG SG to BG Enable Lag Time 4V On/Off Thresholds ● 80 150 300 ns tTG-BG TG to BG Enable Lag Time 4V On/Off Thresholds 100 ns
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 3:
Guaranteed but not tested. of a device may be impaired.
Note 4:
The LT1681E is guaranteed to meet performance specifications
Note 2:
Supply current specification does not include external FET gate from 0°C to 70°C. Specifications over the – 40°C to 85°C operating charge currents. Actual supply currents will be higher and vary with temperature range are assured by design, characterization and correlation operating frequency, operating voltages and the type of external switch with statistical process controls. For guaranteed performance to elements used. See Applications Information. specifications over the –40°C to 85°C range, the LT1681I is available.
W U TYPICAL PERFOR A CE CHARACTERISTICS ICC Supply Current ICC Supply Current ICC Supply Current vs Temperature vs SHDN Pin Voltage vs VCC Supply Voltage
20 1100 18 V T CC = 12V A = 25°C TA = 25°C 19 900 17 18 17 700 16 SUPPLY CURRENT (mA) SUPPLY CURRENT (nA) SUPPLY CURRENT (mA) I CC I CC 16 I CC 15 500 15 –55 –40 0 40 80 125 0 100 200 300 400 500 9 10 12 14 16 18 TEMPERATURE (°C) SHDN PIN VOLTAGE (mV) SUPPLY VOLTAGE (V) 1681 G01 1681 G02 1681 G03 1681f 4
